/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.state.ttl.mock;

import org.apache.flink.api.common.state.State;
import org.apache.flink.api.common.state.StateDescriptor;
import org.apache.flink.api.common.typeutils.TypeSerializer;
import org.apache.flink.runtime.state.internal.InternalListState;

import java.util.ArrayList;
import java.util.List;

/** In memory mock internal list state. */
class MockInternalListState<K, N, T>
	extends MockInternalMergingState<K, N, T, List<T>, Iterable<T>>
	implements InternalListState<K, N, T> {

	private MockInternalListState() {
		super(ArrayList::new);
	}

	@Override
	public void update(List<T> elements) {
		updateInternal(elements);
	}

	@Override
	public void addAll(List<T> elements) {
		getInternal().addAll(elements);
	}

	@Override
	List<T> mergeState(List<T> acc, List<T> nAcc) {
		acc = new ArrayList<>(acc);
		acc.addAll(nAcc);
		return acc;
	}

	@Override
	public Iterable<T> get() {
		return getInternal();
	}

	@Override
	public void add(T element) {
		getInternal().add(element);
	}

	@Override
	public void clear() {
		getInternal().clear();
	}

	@SuppressWarnings({"unchecked", "unused"})
	static <N, T, S extends State, IS extends S> IS createState(
		TypeSerializer<N> namespaceSerializer,
		StateDescriptor<S, T> stateDesc) {
		return (IS) new MockInternalListState<>();
	}
}
